161658423 has 24 divisors (see below), whose sum is σ = 256405968. Its totient is φ = 101430144.

The previous prime is 161658391. The next prime is 161658451. The reversal of 161658423 is 324856161.

It is a happy number.

It is not a de Polignac number, because 161658423 - 2⁵ = 161658391 is a prime.

It is a super-2 number, since 2×161658423² = 52266891453693858, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161658463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15436 + ... + 23697.

It is an arithmetic number, because the mean of its divisors is an integer number (10683582).

Almost surely, 2^161658423 is an apocalyptic number.

161658423 is a deficient number, since it is larger than the sum of its proper divisors (94747545).

161658423 is an equidigital number, since it uses as much as digits as its factorization.

161658423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39165 (or 39153 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 161658423 is about 12714.4965688776. The cubic root of 161658423 is about 544.7527683733.

The spelling of 161658423 in words is "one hundred sixty-one million, six hundred fifty-eight thousand, four hundred twenty-three".